Sky Surfer - aka Bixler See Post #2 & #3 for parts & mods B4 asking - Page 1042 - RC Groups
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Jun 05, 2012, 01:44 AM
Argue for your limitations
ajbaker's Avatar
Quote:
Originally Posted by Limited flyer
So are you talking about just testing seperate bec's or ones that are built in as well? What about swtch mode?
sBEC is switch mode. For me, my plan is to test an external 5A BEC with a 50A without a BEC builtin. I want to keep the experiment as clean as possible. That would be very hard to do with 2 different ESC's with built in BEC's with both linear and switch mode. It seems that Turnigy 40A ESC has both configurations. But, I think it is still a better experiment using a separate BEC for a common ESC (with no BEC built-in). This is kind of an open invitational experiment for anyone in this thread. I invite anyone to follow whatever method they use for this. The only thing I ask is that each person post his number's here in this thread. The final objective is to determine if we collectively recommend everyone with a SkyS/Bix should convert their configuration to an external sBEC for better cooling and safety. To keep consistency as much as possible, I suggest that we all use a stock motor and stock prop. That way, we control the base components as much as we can.
AJ

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Jun 05, 2012, 06:34 AM
Registered User
Well seeing as my EasyStar committed suicide in a very dramatic fashion on Sunday (flying in too much wind and literally flew the wings off it, ended badly, not repairable) this is going to be my next plane, kit is on the way from readymadrc with some electronics coming from rtctimer (I want to keep the EasyStar stuff for a future project). Trying to catch up on the mods to this airframe and getting supplies together for the recommended upgrades, I can't wait to get this in the air and have some fun, and hopefully keep the wings attached in flight....
Jun 05, 2012, 07:18 AM
Registered User
Quote:
Originally Posted by jj604
I know I wasn't supposed to read this but for those who are interested in the question there's bit more info in my post here

https://www.rcgroups.com/forums/show...ostcount=14945

In summary 4x HXT900's stalled pull just under 2.5A.

All the 3A UBECs I tested could actually deliver 3A continuously but a lot of them got very hot at that current. None actually failed, but after 10minutes at 3A some were well over 80C (180F).

So in practice you aren't going to have problem with a 3A switched BEC on a Bixler/Skysurfer since the chances of running 4 servos stalled for 10 minutes AND staying airborne are zero for other reasons I would think.

So those test results being known brings up a question. Do we know what the stock SS ESC is as far as the rated and or actual BEC specs or limitations
Jun 05, 2012, 10:12 AM
Registered User
Quote:
Originally Posted by Navy Chief
Well seeing as my EasyStar committed suicide in a very dramatic fashion on Sunday (flying in too much wind and literally flew the wings off it, ended badly, not repairable) this is going to be my next plane, kit is on the way from readymadrc with some electronics coming from rtctimer (I want to keep the EasyStar stuff for a future project). Trying to catch up on the mods to this airframe and getting supplies together for the recommended upgrades, I can't wait to get this in the air and have some fun, and hopefully keep the wings attached in flight....
Speaking of wings attached (not sure whether yours broke up or just came out), but my son thought of a unique solution to keeping the wings in. He stuck 2 toothpicks in through the fuselage into the wing on each side, one at the front and one at the back edge. We have not tested it yet, but it seems like it should hold until they vibrate the toothpick holes bigger and start wobbling again.

My next solution if this didn't work is some rare-earth magnets and velcro.
Jun 05, 2012, 10:18 AM
Registered User
Scooch's Avatar
Quote:
Originally Posted by cassb
My next solution if this didn't work is some rare-earth magnets and velcro.
Velcro doesn't work. I tried that and the wings continued to seperate while in flight.
Jun 05, 2012, 11:11 AM
Limited flyer
Limited flyer's Avatar
Quote:
Originally Posted by cassb
Speaking of wings attached (not sure whether yours broke up or just came out), but my son thought of a unique solution to keeping the wings in. He stuck 2 toothpicks in through the fuselage into the wing on each side, one at the front and one at the back edge. We have not tested it yet, but it seems like it should hold until they vibrate the toothpick holes bigger and start wobbling again.

My next solution if this didn't work is some rare-earth magnets and velcro.
The mod i use for wing retension is the command hooks/rubber band method.
Works super.
If you use this mod, simply attatch your hooks on top side of wing,right around the spar erea, then stretch your rubber band on them and voila.
Some pics, very simple mod, plus great cheap insurance.
Got this mod from somone from here,can't remember from who,just passing it along.
Last edited by Limited flyer; Jun 05, 2012 at 11:16 AM.
Jun 05, 2012, 11:40 AM
wic
wic
Registered User
Quote:
Originally Posted by Scooch
Velcro doesn't work. I tried that and the wings continued to seperate while in flight.
What type of Velcro you had used?
I have also Velcro and its very stable.

Andy
Jun 05, 2012, 01:33 PM
Registered User
Scooch's Avatar
Quote:
Originally Posted by wic
What type of Velcro you had used?
I have also Velcro and its very stable.

Andy
Don't remember. It didn't work for me so I moved on. I also use the command hooks on the wings. Here is a small piece of plastic that I cut from a gatorade bottle to help protect the foam.
Jun 05, 2012, 02:52 PM
ICrashRCs
Good Velcro used properly works fine. You can't just velcro the ends of the wing together.
See page 1, Post 3, Mod 6
https://www.rcgroups.com/forums/show...postcount=2149
Last edited by IFlyRCs; Jun 05, 2012 at 02:58 PM.
Jun 05, 2012, 02:54 PM
Limited flyer
Limited flyer's Avatar
So i have to thank you for that huh, well, thanksdid'nt use any plastic pieces though, the rubber band does not have to be super tight to do the job.
Jun 05, 2012, 02:58 PM
Registered User
Scooch's Avatar
Quote:
Originally Posted by Limited flyer
So i have to thank you for that huh, well, thanksdid'nt use any plastic pieces though, the rubber band does not have to be super tight to do the job.
No, don't thank me. I did re-post it earlier but I got it from someone else. Works good.

Here is a question. I just got a replacement carbon fiber tube for the wingspar. The tube I got is 6mm x 5mm. I also have a 4mm tube that I want to put inside the 6mm tube for added strength. Would it be better to just slide the smaller tube in or would gluing it in with epoxy or CA be better for strength?
Jun 05, 2012, 03:03 PM
Registered User
Prof100's Avatar
Quote:
Originally Posted by Scooch
No, don't thank me. I did re-post it earlier but I got it from someone else. Works good.

Here is a question. I just got a replacement carbon fiber tube for the wingspar. The tube I got is 6mm x 5mm. I also have a 4mm tube that I want to put inside the 6mm tube for added strength. Would it be better to just slide the smaller tube in or would gluing it in with epoxy or CA be better for strength?
Glue it with epoxy or gorilla glue. CA will kick off before you get them slid together. You'd have a tapered fishing pole.
Last edited by Prof100; Jun 05, 2012 at 03:43 PM.
Jun 05, 2012, 03:07 PM
Limited flyer
Limited flyer's Avatar
Quote:
Originally Posted by Scooch
No, don't thank me. I did re-post it earlier but I got it from someone else. Works good.

Here is a question. I just got a replacement carbon fiber tube for the wingspar. The tube I got is 6mm x 5mm. I also have a 4mm tube that I want to put inside the 6mm tube for added strength. Would it be better to just slide the smaller tube in or would gluing it in with epoxy or CA be better for strength?
What i do is just glue the two ends once the small one is in the big one, but one could drizzle glue on the whole leanth of it, it'll have to be your call on how you do it, either would work fine.
Jun 05, 2012, 03:55 PM
Novice in training
JoshB's Avatar
I ran a bead all the way around the inner rod with foam safe CA then slid it in. Acted like lube but be quick. If u stop to long it will set up and like said above u will have a carbon fiber fishing rod. lol


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